Electrical connecter device



Dec. 8, 1925.

s. M CLATCHIE ELECTRICAL CONNECTER DEVICE Filed Jan, 16. 1920 fltiawneyson the line 3-3 of Fig. 2;

Patented Dec. 8, 1925.

UNITED STATES STANLEY MccLA'rrcHIn, or oiuvrnnrnen, MASSACHUSETTS,nssrenon. To BENJAMIN ELECTRIC MANUFACTURING COMPANY, OF CHICAGO,ILLINOIS, A CORPORATION OF ILLINOIS.

ELECTRICAL CONNECTER DEVICE.

' Application filed January 16, 1920. Serial No. 351,820.

To all whom it may concern:

Be it known that I, STANLEY MOCLATCHIE, a citizen of the United States,residing at Cambridge, in the county ofMiddlesex. and State ofMassachusetts, have invented new and useful Improvements in ElectricalCon necter Devices, of which the following is a.

full, clear, concise, and exact description, reference being had to theaccompanylng drawing, forming apart of this specification.

My invention relates to electrical connecter' devices. Morespecifically, it relates to swivel attachment plugs.

Among the objects of my invention are to provide an. improved swivelattachment plug which can be easily wired, and in which the wiringconnections are well made, which can be conveniently handled, and whichwill be simple in construction, easy to manufacture and durable andefficient in use.

Another object of my invention is to improve certain features ofconstruction of electrical connecters.

Further objects will appear from the detailed description to follow andfrom the appended claims.

In the drawings in which an embodiment of my invention is shown by wayof illustra-,

tion: r

Fig. 1 is a side elevation of an attachment plug; 7

Fig. 2 is an axial section of the plug shown in Fig. 1;

Fig. 3 is an axial. section of the plug Fig. 4 is a side elevation ofterminal carrying portion "of the plug;

Fig. 5 is a plan View of theplug with the cap removed, Fig. 6 is asectional view showing the manner in which the binding terminal carryingportion is removed fromthe threaded shell, and

Fig. 7 is a bottorn'viewot the binding terminal carryingportion.

In order to give a general idea of the construction shown, it is herestated that the connecter device illustrated comprises a two-partinsulating base 10, which supports the center contact 11, and a pair ofWiring terminals, and a threaded shell contact 12, having an inwardlyextending flange portion18, which is held in place by and between thetwo parts of the insulating base tact.

the binding tially inside the threaded shell contact 12,

which supports the wiring terminal 15 for the center contact, and a capportion 16 lo- 3 cated outside of the threaded shell contact, forsupporting thecenter' contact 11.

The construction is such that when th cap 16 is disconnected from thebody portion 14, th body portion can be removed from the threaded shellcontact 12 by working it past the inwardly extending flange portion 13of the threaded shell contact, and such that in wiring the plug thethreaded shell contact 12 with the thumb piece 17 can he slipped on overthe feed wires,'the ends of these wires brought into their properposition with respect to the'wiring terminal parts carried by the bodyportion 14, and this body portion 14 then worked into place within thethreaded shell contact past the flange portion 13 of this threaded shellconpast the flange portion '13 is shown in Fig. 6, and is accomplishedby a relative tilting movement between the body portion and the threadedshell contact, which will be scribed in detail later.

After the body portion 14 has slipped into place past the flange 13,thecap portion 16 is put in place, and secured to the body portion 14,this'connection between the parts 14 and 16 serving to hold the partstogether in their proper position with'respect to each other and thethreaded shell contact 12'. As shown in Fig. 3 the binding screw 15 forthe center contact 11 is in axial alignment with said center contact,both, the center contact 11 and the binding screw 15 being threaded intoan eyelet 18, which extends through an opening in the body portion 14.In order to prevent the end of the feed wire, 19, which is connectedwith the binding screw 15, from being jerked out from under the head ofthis binding screw, and in order to relieve this binding screw from thestrain, a strain-relief mem ber2O is provided, which comprisesa metalstamping which is secured to the body portion 14 by means of the eyelet18, into which the binding screw 15 is threaded. The bared' end of thefeed wire 19 is 'secured under the head of the binding screw 15 and isthen'looped up over this strain- This working of thebody portion 14 headof the screw 15, brought around over the strain-relief member, andthrough the opening 21' in the thumb piece. This bending of'the feedwire around the strain-relief member prevents any considerable pullbeing exerted on that part of the wire which is adjacent the bindingscrew.

The thumb piece l7 has an annular inwardly extending insulating barrierportion 22, which cooperates with a barrier portion 'or projection 23 onthe insulating body 1 1 to keep the stray strands ofthe wire 19 fromgetting into engagement with the threaded shell contact 12.-

As shown'in Figs. 1 and 2, the feed wire 24 for the threaded shellcontact is clamped between the insulating. body 14 and the cap 16 andthus forced firmly into engagement with the annular sliding contactmember 25, which is'secured to the cap 16. The sliding contact member 25thus acts as-a terminal for the feed wire 24. This clamping of the feedwire 24 between the two parts of the insulating. base is accomplishedsimply by screwingthe center contact 11 into the internally threadedeyelet 18. In order to insulate the bared end of this feed wire 25 fromthe center contact screw 11, the in sulating body 14 is provided with anupstandingannular flange or barrier 26, which surrounds the, screw 11when the parts are in assembled position, the bared end of the feed wire24 being wrapped around this annular barrier as shown 1n Figs. 4; and

5. To further insure against stray strands of the ends of the wire 27getting into engagement with the center contact screw 11, the cap 16'may be provided with a downwardly extending annular flange or barrierportion 27 which' extends downwardly into the annular space between thecenter contact screw 11' and the annular barrier 26. The annular barrier'26 fits in a corresponding recess in the cap, this interfitting partservingto center the cap withrespect to the body portion 14, tofacilitate assembling of the parts, and to enable the center contactscrew ll to be lined up with the bushingv 18: The annular-barrier 26also serves -asa handle to assist; in removing the body 13' with respectto the threaded shell contact 12, as will be shown in Fig. 6.

In order to prevent the ends'of the feed wire 24 from being jerked outfrom enga gement, and in order to release the strain on this bindingterminal construction, the body portion 14; is provided with a.tortuouspassage 28 (Figs 6 and 7) in which the feed wire 24 is laid, thestemsin this passage serving to relieve the binding terminal; fromstrain.

The sliding contact member 25 maybe a sheet metal stamping secured inplace on the cap 15 by being flanged over as indicated at 29.The-threaded shell contact 12 may be secured to the thumb piece 17 byscrewing it thereon, and pressing the shell contact into reoessesin thethumb" piece 17 as indicated at 30.: (Figs: 3 -and-5-.)

Referring again to the tortuous passage 28, I have designed this so thatit can e formed by an inwardly extending projection on the die, meetingand passing an inwardly extending projection on the matrix, as thepartis being molded- As shown in Fig. 6', the side wall 31' at the upperportion of the tortuous passage is in alignment with the opposite" sidewall 32 at the bottom of this tortuous passage. Theupper portionof thepassage is formed by an inwardly extending projection on adownwardlymovingdie, the end of which extends as far asthe portion33 of thepassage, and the lower portion" of the passage 28 is formed by aninwardly extending projection on the matrix, the upper end of whichextends up to the portion 34 of the passage, the edge ofthe inwardlyextending projection on the die meeting and pass ing the upper edge ofthe inwardly extend ing projection on the matrix. 1

I will now describe more in detail the con'. struction whereby the bodyportion 1 1 can be slipped into and out of the threaded shell contact Asshown inFigs. 2, 6 and 7, this body portion 1a is providedwith an ellipitica l flange portion the smaller diameter of which ellipticalflange is less than the diameter of the circular opening: in the flange13of the threaded shell contact, and the major diameter of whichelliptical flange is greater in diameter than the diameter ofthiscircular opening. in the flange of the shell. This elliptical flangethus constitutes in effect tW'ZO: laterally extending. wing. portions",which can be caughtunder the circular flange 13, by sidewise and tiltingmovement of the body 15-1 with respectto theshell cont-act. v

After the body portion 14 has been 10- catedein its properposition inthe shelhcontact 12, with both sides otthe flange 35 caught underthe-flange 13, the-cap 1 6 'is slipped in place onto the' body portion-1 1, and the center contact screw 11 is: screwed into the bushing 18 todraw the two parts of the insulating base substantially together toclamp the feed wire24 firmly in place, and to hold the-parts of thehasetogether. This screwing in of the screw 11 clraws' tl1ecircularshoulderportion 36 of the base 14 up into-thecircularopenihginthe flange 13 of the threadedshell contact and thus centerstheinsulati-ng. base with respect to the shell con-tact.- v

I The method of wirin'g' andthe circuit has been indicated in connectionwiththe description of the construction.

The plug is 139 wired by slipping the thumb piece 17 and the insulatingshell 12 over the ends of the feed wires 19 and 24. The end of the feedwire 19 is then secured under the head of the binding screw 15, and thewire is looped up over the strain-relief member 20. The wire 24 is thenplaced'in the tortuous groove 28 and the bared end wrapped around theThe circuit is from the cent-er contact 11 through the bushing '18, feedwire 19,

through whatever translating device is connected with the plug, to thefeed wire 2t, and thence through the sliding contact member 25, to thethreaded shell contact 12.

This application is a continuation as to common subject matter claimedherein of 'iny copending application Serial N 0. 284,113, 1

filed March 21, 1919. 7

Having thus described my invention, what I claim as new and desire tosecure by Leo ters Patent of the United States is:

1. A swivel attachment plug comprising a swivel contact, having aninwardly ex tending annular flange at its entering end, a two-partinsulating base, the parts having portions located 011 opposite sides.of the flange respectively, for positioning the c0ntact withrespect tothe base and binding terminal members and a center contact sup ported bysaid base, said center contact construction comprising a screw, the wirefor the shell contact being clamped between the parts of the base by theaction of said center contact screw.

2. Abinding terminal construction comprising a binding screw beneath thehead of which the wire is caught, a strain relief member around whichthe wire is bent and an eyelet for securing'said strain-relief member inposition, said binding screw being threaded into said'eyeletr 3. Aswivel attachment plug comprising an insulating body, and a contactswiveled on said body, said body being divided transversely into forwardand rearward parts, means for securing the parts together w th anannular space therebetween, said contact 1 having a flange'extendinginto saidannular space to restram'axial movement of the contact relativeto the body, the 'rearwardpare of the body having a diametersufiiciently small to 13617111311] to" be inserted into said contactthrough the forward open end there of, and having an eccentric portionfor ex tending'behind said flange whenthe rearward part has entered thecontact,

4:. A swivel attachment plug comprising an insulating body and a contactswiveled on said body, said bodyt being divided transversely intoforward and rearward parts, means for securing the parts together withan annular space'therebetween, said contact having a flange extendinginto said annular space to restrain axial movement-ofthe shell relativeto the body, the rearward part of the body having a diametersufficiently small to permit it to be inserted into the contact throughthe forward opening thereotand .1

having an eccentric portion extending behind said flange when therearward part is centered inthe' contact, one of said body parts havinga projection to fit into. said flange to center both parts ofsaid body,'the parts being connected together by said means In witnesswhereof, I have hereunto sub scribed my name.

STANLEY MGOLATGHIE.

